1968 DATSUN 510 cooling

II

CHAPTER
SIX

ENGINE

Cylmder
block

Crankshaft

PistOns
and

connectmg
rods

Cyhnder
head

Camshaft

Valve
mechamsm

Camshaft
dnve

Mamfolds

011

pump

Fuel

pump
Carburetor

Emission
control
devIces

Engme
removal

Engme
dISassembly

Pistons
and

connectmg
rods

Cyhnder
head

Engme
mspectIon
and

replllr

Engme
reassembly

Service
data
and

speCifications

CHAPTER
SEVEN

FUEL
SYSTEM

Air
cleaner

Fuel
strlllner

Fuel

pump
Carburetor

Fuel
tank

1
CHAPTER

EIGHT

COOLING

SYSTEM

DescnptIon

Water

pump

Fan
clutch
Thermostat

Radiator

CHAPTER
NINE

ENGINE

ELECTRICAL
SYSTEM

Starter

Overrunmng
clutch

assembly

ChargIng
ClrcUlt

Alternator

Alternator

output

Voltage
regulator
DIstrIbutor

Condenser

Igrntlon
cod

SpeCifications

Spark
plugs

CHAPTER

TEN

EMISSION

CONTROL

SYSTEM

Exhaust
emiSSIOn

control

Crankcase

emission
control

Air

mJectlon
system
Engme
modifications

Evaporative
emiSSion
control

Exhaust

system

CHAPTER
ELEVEN

CLUTCH

TRANSMISSION
AND
DRIVESHAFT

Clutch

TransmissIon

Master

cyhnder
TransmissIon
data
and

speCIfications

Operating
cyhnder
Dnveshaft

Withdrawal
lever

adjustment
Dnveshaft
data
and

speCIfications

Clutch

system

bleedmg
Automatic
transmIssIon
checks

Clutch
data

and

speCIfications
31

62

84

91

114

127

22
CHAPTER

FOUR

CD

Normal

plug

appearance
noted

by
the
brown
to

graYish
tan

deposits
and

slight
electrode

wear
This

plug
rndlcates
the
correct

plug
heat

range
and

proper
air
fuel
ratio

f

j

l

Carbon

fouling

dlstrngUlshed
by
dry
fluffy
black

carbon

deposits
which

may
be
caused

by
an
over

nch
alr
fuel
mixture
excessIVe

hand

chokrng

clogged
air
filter

or
excessive
Idling

lJ
6

1

4i

Z

011

fouling
rndlcated

by
wet

OIly

depOSits
caused

by
011

pumprng
past
worn

rrngs
or
down
the
rntake

valve

gUides
A
hotter

plug
temporanly
reduces
011

depOSits
but
a

plug
that
IS

too
hot
leads
to

pre

IgmtlOn
and

possible
engrne
damage
Red
brown

yellow
and
white

coatrngs
caused

by

fuel
and
011
additives
These

depOSits
are
not
harm

ful
If

they
remarn

rn
a

powdery
form

C

I

Shrny
yellow
glaze
on
rnsulator

cone
IS
caused

when

the

powdery
depOSits
from
fuel
and
011
additives

melt

Meltrng
occurs
dunng
hard

acceleration
after

prolonged
Idling
This

glaze
conducts

electnclty

and
shorts

out
the

plug

Overheated

plug
rndlcated

by
burned
or
blistered

rnsulator

tip
and

badly
worn
electrodes
This
condl

bon

may
be
caused

by
pre
Igmtlon
cooling
system

defects
lean
air

fuel
ratiOS
low
octane
fuel
or
over

advanced

Igmbon
bmrng

Spark
plug
condition

photos
courtesy
of
At

Spark
Plug
DIvision
General
Motors

Corporation

The

procedures

given
below
would

generally

apply
to
eIther

type
In
the
dual

pomt
system

one
set
of

pomts
IS
known
as
the
advance
set

and
the
other
the
retard
set

Complete
details

are

given
m

Chapter
Nme

Figure
4
IS
a
detaIl

of

the
dual

pomt

system

1
Remove
dIStnutor

cap
Clean

It

carefully
to

remove

grease
or
dIrt

2
Examme
the
mSIde
of
the

cap
for
d1rt
or
ex

ceSSIve
wear
Look
for

SIgns
of
carbon
tracks
arcmg
from
contact
to
contact
mSIde
the
dIS

trIbutor

cap
Carbon
tracks
mdlcate
defects
or

cracks
and
If
found
the

cap
should
be

replaced

3
Remove
the
rotor
and

mspect
for
exceSSIve

wear
around
the

top
metal
contact

wiper
surface

If

defectlve
replace
As

a
matter
of

good

prac

nce
the

rotor
should
be

replaced
whenever
the

contact

pomts
are

replaced

4
Use
a
screwdriver
to

gently
open
the
contact

pomts
If

they
show
wear
or

plttmg
remove
the

I

7
r

CHAPTER
EIGHT

COOLING
SYSTEM

The

coolIng
system
IS
of
the
closed

pressure

type
Coolant
flows

through
passages
In
the

cyl

mder
head
and
block
and
is
cooled

by
the

radIator
water

pump
and
thermostat

Figure
1

mdlcates
normal
flow

The
radIator
is

a

corrugated
fin

type
wh1le

the
thermostat

IS
a

pellet
desIgn
The
water

pump

IS

centnfugal
and
has

an
alummum
dlecast

body

CD
Several

changes
have
been
made
in
the
water

pump
assembly
over
the

years
pnmanly
be

cause
of

changmg
ennSSlon
cootrol

require

ments
The
diSCUSSIOn
and

procedures
that
fol

low
cover
1970
and
1971

models
However

complete
IllustratIve
material

IS

given
for
all

model

years
so
that

dIfferences
can

readIly
be

identIfied
In
the
models
With
aIr

conditionmg

COOLING
SYSTEM
8S

and

In
those
with
exhaust
and

evaporatIve
emIS

sion
control
devIces
a
fan
clutch
IS
combIned

WIth
the
thermostat
to
detect

temperature
m
the

engme
compartlnent
When
the

temperature

nses
the
thermostat
detects
the

change
an
the

fan
clutch

engages
thereby
helpmg
to
cool
the

engme

WATER
PUMP

Figure
2

page
86
IS
an

exploded
drawmg
of

the
water

pump
and
fan

assembly
for
1970
to

1971
The

top
half
of
the
IllustratIon

applIes
to

those
models
WIth
exhaust
and

evaporatIve

emiSSIOn
control

systems
The
bottom
half
covers

models
WIth
a
crankcase

emiSSIon
control
deVIce

only

Figure
3

page
87

IS
an

exploded
drawmg
of

the
water

pump
and
fan

assembly
for
1968

models
Without
exhaust

or

evaporatIve
controls

Figure
4

page
88
shows
the
1968
model
With

emISSIon
control
deVIce
As

can
be
seen
from
the

illustratIons
most
dIfferences
eXISt
withIn
the

fan
clutch

assembly

Water

Pump
Removal

1
Remove

upper
and

lower
radIator
hoses
from

the
thermostat

housmg
and

cylmder
block
re

spectIvely
Dram
coolant
from
rad1ator
and

cylInder
block

2
Loosen
the
alternator

mountlng
bolt
and
the

adjustIng
bolt
on
the
alternator

mountIng

bracket

3
Move
the
alternator
toward
the

cylinder

block
untIl
slack
IS
eVIdent
10

the
fan
belt
Re

move
fa
belt
fro
alternator
water

pump
and

crankshaft

pulley

4
It
IS
difficult
to
remove
the
water

pump
from

the
front

housmg
With
the
radiator
and

top

shroud
10

place
so
remove
them

5
Remove
the
bolts

holdmg
the
fan

assembly

to
the
water

pump
and
remove
the
fan

assembly

6
Remove
the
bolts

holdmg
the
water

pump
to

the
front

housmg
as
shown
In

Figure
S

Water

Pump
Disassembly
Repair
and

Assembly

Disassembly
or

attempted
repaIr
of
the
water

pump
assembly
IS
not
recommended
If
the

pump
assembly
IS
corroded
the

vanes
are
dam
aged
or
the

bearmgs
are

nOISY

replace
the

entIre
umt

1

Inspect
the
water

pump
assembly
and

replace

If

reqUIred

2

If
the
water

pump
assembly
IS
stIll
serVIce

able
clean
It

thoroughly
before
mstallatIon

3
Assemble
the
water

pump
assembly
m
the

front
cover
10
the
reverse
order
for

disassembly

Do
not
reuse
old

gaskets

4

Replace
the
fan

assembly
on
the

water

pump

and
mstall
the
radiator
and

top
shroud

5

Inspect
the

fan
belt

carefully
for

SIgnS
of

wear

or
cracks
DIscard

It
If
10
doubt

6
Install
the
fan
belt
around
the
crankshaft

pulley
water

pump
pulley
and
the
alternator

pulley

7

Adjust
the
alternator
on
Its
bracket

so
there

IS
no
more
than
0
5
10

deflection
of
the
fan

belt
when

pushed
10

by
thumb

pressure

8

TIghten
alternator
bracket

adjustIng
bolt
and

alternator

mountmg
bolt

securely

9
Install
the

upper
and
lower
rad1ator
hoses

and

tIghten
securely

10
Refill
the
radIator
and

coolmg
system
With

approved
coolant

or
water

NOTE
Because

of
the

many
aluml

num

parts
In
the

engine
a

hIgh
qualIty

antI

freeze

compound
should
be
used

In
the

cooling
system

11
Start
the

engme
and
run
untIl

operatIng

temperature
IS
reached
or
untIl

you
re
sure
the

thermostat
has

opened
and
coolant
IS

CIrCulatIng

throughout
the
entIre

coolIng
system
Top
up

radIator
as

reqUIred

10

f
e

2
Weter
pump
gasket

3
Water
pump
tlXlng
bolt

4
Lock
washer

5
Water
pump
tlXlng
bolt

6
Hex
bolt

7
Hex
bolt

8
Lock
washer

9
Fan
pulley

10
Fan
clutch
assembly

11
Cooling
tan

12
Fan
lock
washer

13
Hex
bolt

14
Fan
belt

15
Dealing
assembly

16
Seal
assembly

17
Seatassembly

18
Lock
wire

19
Vane
assembly

20
Hub
pulley

24
Water
pump
seal
kit
Illl

t
l

10
9
8
n
o
o

19
1
Water
pump
assembly
11
lock
washer

2
Water
pump
body
12
Hex
bolt

3
Water
pump
ane
13
Hex
bolt
With
lock
washer

4
Water
pump
seal
14
loc
l
washer

17
6
5
Water
pump
beanng
15
Fan
and
water
pump
pulley

6
Water
pump
bee
ring
lock
16
Cooling
tan

7
Water
pump
hub
17
Fan
and
water
pump
lock

8
Water
pump
seat
washer

9
Water
pump
gasket
18
Hex
bolt

10
Hex
bolt
19
Fen
belt
I
I

COOLING
SYSTEM
89

FAN
CLUTCH

Fan
Clutch

Operation
and

Inspection

Figure
6
shows
a

typICal
fan
clutch
dISas

sembled
Check
the
umt
whenever
the
water

pump
IS
removed
or
whenever
troubles
are

suspected
m
the

assembly
OperatIon
of
the
fan

clutch
should

be
observed
when
the
vehIcle
is

at

nmning

temperature

Operation
plate
Dust
cover
Drum

o9
Q

SpIder
assembly
LIning

CD

1
Warm

up
the

engme

2
MaIntam

engIne
speed
at
2
500

rpm

3

Usmg
a
thermometer
measure
the

temper

ature
close
to
the
fan
clutch

assembly
on
the

fan

4
The
clutch
should

engage
when
the

temp

erature
reaches
17

degrees
F
65

degrees
C

Conversely
the
clutch
should

deenergIze
when

the

temperature
drops
to
97

degrees
F
54
de

grees
C

5
Take
the
measurements
at
least
twice
SInce

the
thermostat
has
somewhat
of
a
tlme

lag

6
If
the
fan
clutch
falls
to

operate
properly
It

should
be
dIsassembled
and
servIced

Fan
Clutch

Disassembly

1
Follow
the
mstructIons
as

prevIOusly
gIven
to

remove
the
fan
and
clutch

assembly
from
the

water

pump

2
Refer
to
the

appropnate
exploded
illustratIon

for

your
model
and

to

Figure
7
which
shows
a

typiCal
fan
clutch

assembly

3
DIsassemble
unit
and

mspect
all

parts
for

signs
of
wear
or

breakage

4
To
check
the

operatIon
of
the
fan
clutch

thermostat

submerge
the

operatIon

plate
With

the
thermostat
In
hot
water
of
126

degrees
F

70

degrees
C
for
two
to
three
mmutes

Replace

if

It
faIls
to

operate

5
Assemble
the

fan
clutch
m
the
reverse
order

o

dIsassembly
THERMOSTAT

The

system
thermostat
IS
located
inside
the

water
outlet
elbow
on
the

upper
left
hand

por

bon
of
the

cylInder
head
The

temperature
sens

Ing
deVice

IS
threaded
Into
the
base
of
the
therm

ostat

housmg
and
IS
connected

electrlcally
to

the

temperature
gauge
WIthIn
the
vehIcle
dash

board

The

wax

pellet
m
the
thermostat

expands

when
heated
and
contracts
when
cold
The

pellet

IS
connected

through
a

pIston
to

a
valve

Expan

sion

pressure
IS
exerted

agalUst
a
rubber
dIa

phragm
which
forces
the
valve
to

open
and

per

rrut
coolant
to
flow

through
the
entIre

system

As
the

pellet
cools
contractIOn
allows

a

spnng

to
close
the
valve

Thermostat
Removal

1

Open
the
draIn
cock
on
the
bottom
of
the

radiator
and
dram
out

enough
coolant
so
that

the
level
In
the
radIator
IS
below
the
bottom
of

the

upper
radIator
hose

2
DIsconnect
the

upper
radIator
hose
from
the

water
outlet
elbow

3
Remove
the
two
nuts

holdIng
the
water
outlet

elbow
to
the
thermostat

housmg

4
Remove
the

gasket
and
thermostat
from
the

housmg
as
shown
m

FIgure
7

Thermostat

Inspection
and

Replacement

Submerge
the
thermostat
In
a

pan
of
water

Heat
the
water
and
momtor
the

temperature

2
The
thermostat
should
start
to

open
at

1796
1
27

degrees
F
82
1
1
5

degrees
C
Max

Imum

opemng
should
occur
at
203

degrees
F
95

ENGINE
ELECI
RICAL

SYSTEM

113

i

Normal

plug
appearance
noted

by
the
brown

to

graYlsll
lan

depOSits
and

slight
eleclrode

wear
This

plug
indicates
the
correct

plug
heal

range
and

proper
air
fuel

ratio

jI

Jo

t
Ql
i

Carbon

fouhng

distinguished
by

dry
fluffy
black

carbon

depOSits
which

may
be
caused

by
an

over

rich

alr
lue
mixture
excessive
hand

choking

clogged
air

filler
or
excessl
e

Idling

t
I

j
if

r
l

1

tfc
ji

0
1

fouling
indicated

by
wet

o
ly
depOSits
caused

by
011

pumping
past
worn

rings
or
down
the
Intake

valve

gUIdes
A
hotter

plug

temporanly
reduces

011

depOSits
but
a

plug
that
IS

too
hot
leads

to

pre

Ignition
end

possible

engine
damage
@

Red
brown

yellow
and
white

coatings
caused

by

luel
and
011
addltl

es
These

depOSits
are

not
harm

ful
If

they
remain
In
a

powdery
lorm

pr

11

L
J

J

S

C

ShinY
yellow

glaze
on
Insulalor
cone
IS

caused
when

the

powdery

depOSits
from
fuel

and
011
addltl
es

melt

Melting
occurs

during
hard

acceleration
alter

prolonged
Idling
This

glaze
conducts

electnclty

and

shorts
out
the

plug

e

1

A
I

A

I

7

Overheated

plug
indIcated

by
burned

or
blistered

Insulator

tiP
and

badly
worn
electrodes
ThiS
condl

J

tlon

may
be

caused

by
pre
Ignition

cooling
system

defects
lean
alr

luel
ratiOS
low
octane
luel

or
o
er

advanced

Ignition
timing

Spark
plUI
condition

photos
courtesy
of
AC

SPIr1l
Plug
Olv
s
on

Gene
MolDrs

Corporlllon